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76eea4ab4e
[cipher.c cipher.h kex.c kex.h kexgexc.c]
Add a special case for the DH group size for 3des-cbc, which has an
effective strength much lower than the key size. This causes problems
with some cryptlib implementations, which don't support group sizes larger
than 4k but also don't use the largest group size it does support as
specified in the RFC. Based on a patch from Petr Lautrbach at Redhat,
reduced by me with input from Markus. ok djm@ markus@
206 lines
5.6 KiB
C
206 lines
5.6 KiB
C
/* $OpenBSD: kex.h,v 1.61 2014/01/25 10:12:50 dtucker Exp $ */
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/*
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* Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef KEX_H
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#define KEX_H
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#include <signal.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#ifdef OPENSSL_HAS_ECC
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#include <openssl/ec.h>
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#endif
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#define KEX_COOKIE_LEN 16
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#define KEX_DH1 "diffie-hellman-group1-sha1"
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#define KEX_DH14 "diffie-hellman-group14-sha1"
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#define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
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#define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
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#define KEX_RESUME "resume@appgate.com"
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#define KEX_ECDH_SHA2_NISTP256 "ecdh-sha2-nistp256"
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#define KEX_ECDH_SHA2_NISTP384 "ecdh-sha2-nistp384"
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#define KEX_ECDH_SHA2_NISTP521 "ecdh-sha2-nistp521"
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#define KEX_CURVE25519_SHA256 "curve25519-sha256@libssh.org"
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#define COMP_NONE 0
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#define COMP_ZLIB 1
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#define COMP_DELAYED 2
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enum kex_init_proposals {
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PROPOSAL_KEX_ALGS,
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PROPOSAL_SERVER_HOST_KEY_ALGS,
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PROPOSAL_ENC_ALGS_CTOS,
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PROPOSAL_ENC_ALGS_STOC,
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PROPOSAL_MAC_ALGS_CTOS,
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PROPOSAL_MAC_ALGS_STOC,
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PROPOSAL_COMP_ALGS_CTOS,
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PROPOSAL_COMP_ALGS_STOC,
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PROPOSAL_LANG_CTOS,
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PROPOSAL_LANG_STOC,
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PROPOSAL_MAX
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};
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enum kex_modes {
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MODE_IN,
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MODE_OUT,
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MODE_MAX
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};
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enum kex_exchange {
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KEX_DH_GRP1_SHA1,
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KEX_DH_GRP14_SHA1,
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KEX_DH_GEX_SHA1,
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KEX_DH_GEX_SHA256,
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KEX_ECDH_SHA2,
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KEX_C25519_SHA256,
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KEX_MAX
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};
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#define KEX_INIT_SENT 0x0001
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typedef struct Kex Kex;
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typedef struct Mac Mac;
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typedef struct Comp Comp;
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typedef struct Enc Enc;
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typedef struct Newkeys Newkeys;
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struct Enc {
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char *name;
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const Cipher *cipher;
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int enabled;
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u_int key_len;
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u_int iv_len;
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u_int block_size;
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u_char *key;
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u_char *iv;
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};
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struct Mac {
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char *name;
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int enabled;
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u_int mac_len;
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u_char *key;
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u_int key_len;
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int type;
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int etm; /* Encrypt-then-MAC */
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const EVP_MD *evp_md;
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HMAC_CTX evp_ctx;
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struct umac_ctx *umac_ctx;
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};
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struct Comp {
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int type;
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int enabled;
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char *name;
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};
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struct Newkeys {
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Enc enc;
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Mac mac;
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Comp comp;
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};
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struct Kex {
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u_char *session_id;
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u_int session_id_len;
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Newkeys *newkeys[MODE_MAX];
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u_int we_need;
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u_int dh_need;
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int server;
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char *name;
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int hostkey_type;
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int kex_type;
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int roaming;
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Buffer my;
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Buffer peer;
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sig_atomic_t done;
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int flags;
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int hash_alg;
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int ec_nid;
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char *client_version_string;
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char *server_version_string;
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int (*verify_host_key)(Key *);
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Key *(*load_host_public_key)(int);
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Key *(*load_host_private_key)(int);
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int (*host_key_index)(Key *);
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void (*sign)(Key *, Key *, u_char **, u_int *, u_char *, u_int);
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void (*kex[KEX_MAX])(Kex *);
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};
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int kex_names_valid(const char *);
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char *kex_alg_list(char);
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Kex *kex_setup(char *[PROPOSAL_MAX]);
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void kex_finish(Kex *);
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void kex_send_kexinit(Kex *);
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void kex_input_kexinit(int, u_int32_t, void *);
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void kex_derive_keys(Kex *, u_char *, u_int, const u_char *, u_int);
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void kex_derive_keys_bn(Kex *, u_char *, u_int, const BIGNUM *);
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Newkeys *kex_get_newkeys(int);
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void kexdh_client(Kex *);
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void kexdh_server(Kex *);
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void kexgex_client(Kex *);
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void kexgex_server(Kex *);
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void kexecdh_client(Kex *);
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void kexecdh_server(Kex *);
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void kexc25519_client(Kex *);
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void kexc25519_server(Kex *);
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void
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kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
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BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
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void
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kexgex_hash(int, char *, char *, char *, int, char *,
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int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
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BIGNUM *, BIGNUM *, u_char **, u_int *);
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#ifdef OPENSSL_HAS_ECC
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void
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kex_ecdh_hash(int, const EC_GROUP *, char *, char *, char *, int,
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char *, int, u_char *, int, const EC_POINT *, const EC_POINT *,
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const BIGNUM *, u_char **, u_int *);
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#endif
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void
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kex_c25519_hash(int, char *, char *, char *, int,
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char *, int, u_char *, int, const u_char *, const u_char *,
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const u_char *, u_int, u_char **, u_int *);
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#define CURVE25519_SIZE 32
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void kexc25519_keygen(u_char[CURVE25519_SIZE], u_char[CURVE25519_SIZE])
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__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
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__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
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void kexc25519_shared_key(const u_char key[CURVE25519_SIZE],
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const u_char pub[CURVE25519_SIZE], Buffer *out)
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__attribute__((__bounded__(__minbytes__, 1, CURVE25519_SIZE)))
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__attribute__((__bounded__(__minbytes__, 2, CURVE25519_SIZE)));
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void
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derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
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#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
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void dump_digest(char *, u_char *, int);
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#endif
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#endif
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